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A definition of bio-availability is the fraction of the ingested nutrient that is absorbed and utilized for normal physiological functions or storage. The main determinant for the bio-availability of a mineral is absorption into the blood. Absorption is influenced by many external factors, such as type of food or vitamin D in case of calcium http://www.purac.com/healthandnutrition/faq.html#faq7
some more examples:
The bio-availability of fluoride from black tea.
Abstract. The bio-availability of fluoride from black tea. The bio-availability
of fluoride from black tea. ... www.tea.co.uk/cgi_gen/reslib/2001080115.htm - 5k - Cached - Similar pages
Bio-availability of calcium in cow's milk
Bio-availability of Calcium in Milk. Some say that osteoporosis is due to poor bio-availability
of calcium in cow’s milk, causing a lack of calcium. ... www.4.waisays.com/bioav.htm - 8k